For what its worth, when I decided to replace my AGM's with LiFePo4 I was told by EP Solar the BN was not suitable for lithiums. I was advised to replace it with their XTRA series MPPT which I did. One other thing of note, the settings they give for lithiums do not play well with Overkill BMS'.
I'm finding this out...started searching...found this thread.
@mikefitz clarified that boost duration starts AFTER the battery has reached boost set voltage. Dear lord, I had it set for 10 minutes - and boost ran for 35 minutes. I thought WTH. This is when I really started digging. The program will not let you set the minimum to less than 10 minutes - found out the hard way by testing the software.
And yeah, their settings don't go with Overkill very well - I have a 4S 120A. High charge voltage makes the full cells over-volt and it shuts down charging.
My Eve LF230 cells got top-balanced to 3.65V, zero amps, pack got built, new converter/charger installed, new solar setup with the new style Tracer Xtra 3210N.
I've been shaking my head and asking a lot of questions, and there's a LOT of confusion on these charge settings.
Here's a few things I found out the hard way...
1. You cannot do ANY custom programming on this unit without the XT50 display or the USB cable and a PC. I understand there's a wifi or BT dongle as well for android, but I skipped all that. Bottom line is you cannot just push buttons to program these new models. The older AN you can - I also have a 1206AN, the 10A mppt - it's the older Tracer model and you can set user parameters with the unit buttons. But it is WAY easier to use the EPEVER controller monitor software.
2. Boost duration - covered. It starts when the battery reaches boost voltage setting on the controller. I suggest you analyze how long you want your lifepo pack to continue to be charged at peak voltage.
3. In my case the Overkill bms starts balancing too high, so with a short boost duration there's no time for balancing. Once the battery gets to 98% of full charge the controller drops to float. Worse, any cell voltage above about 3.5V one or more of them are at fully charged volts and their voltage starts shooting up. Left to continue, the BMS will shut charging down to the whole pack for over-voltage.
4. I am going to try lowering BMS balance on charging to 3.4 if it isn't already, and see if I can get my cells to better balance at high SOC. And lower the boost charge voltage to 14.0 to try to prevent voltage run-away from fully charged cells. Hopefully this will give the BMS some more time to actually do some balancing before any of the cells peak out.
Otherwise I find the controller behaves as expected. You can float at whatever level you want - 3.3 to 3.4 per cell, depending on whether you're resting the pack or servicing a load. And your boost reconnect should be set so that your load is serviced some before the full charging boost and absorption modes start over.
Can someone also confirm that this boost mode starts over each day when the SCC is activated from the PV with some current? I have not been able to test this yet.
It took a lot of searching to find good solutions and answers on this SCC. This thread is invaluable.